Definition I'm using is any color that can be expressed as a single wavelength of light. Purple cannot be, since it's actually two wavelengths simultaneously.
Perceiving it as a color seems more practical though. It's not like we look at "red" and think "ah yes, a single wavelength of light"
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Definition I'm using is any color that can be expressed as a single wavelength of light. Purple cannot be, since it's actually two wavelengths simultaneously.
Perceiving it as a color seems more practical though. It's not like we look at "red" and think "ah yes, a single wavelength of light"